/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.quick.scan.view;

import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.quick.scan.R;
import com.quick.scan.camera.CameraManager;
import com.quick.scan.config.ScanConfig;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 * 
 */
public final class ViewfinderView extends View {

	private static final long ANIMATION_DELAY = 10L;

	private int ScreenRate;

	private static final int SPEEN_DISTANCE = 5;

	private static float density;

	private static final int TEXT_SIZE = 16;

	private static final int TEXT_PADDING_TOP = 30;

	private Paint paint;

	private int slideTop;

	private int slideBottom;

	private final int maskColor;

	private Collection<ResultPoint> possibleResultPoints;
	private Collection<ResultPoint> lastPossibleResultPoints;

	boolean isFirst;

	public ViewfinderView(Context context, AttributeSet attrs) {
		super(context, attrs);

		density = context.getResources().getDisplayMetrics().density;

		ScreenRate = (int) (15 * density);

		paint = new Paint();
		maskColor = ScanConfig.MASK_COLOR;
		possibleResultPoints = new HashSet<ResultPoint>(5);
	}

	@Override
	public void onDraw(Canvas canvas) {
		Rect frame = CameraManager.get().getFramingRect();
		if (frame == null) {
			return;
		}

		if (!isFirst) {
			isFirst = true;
			slideTop = frame.top;
			slideBottom = frame.bottom;
		}

		int width = canvas.getWidth();
		int height = canvas.getHeight();

		paint.setColor(maskColor);

		canvas.drawRect(0, 0, width, frame.top, paint);
		canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
		canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
				paint);
		canvas.drawRect(0, frame.bottom + 1, width, height, paint);

		// 绘制扫描框的边框
		paint.setColor(ScanConfig.CORNER_COLOR);
		canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
				frame.top + ScanConfig.CORNER_WIDTH, paint);
		canvas.drawRect(frame.left, frame.top, frame.left
				+ ScanConfig.CORNER_WIDTH, frame.top + ScreenRate, paint);
		canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
				frame.top + ScanConfig.CORNER_WIDTH, paint);
		canvas.drawRect(frame.right - ScanConfig.CORNER_WIDTH, frame.top,
				frame.right, frame.top + ScreenRate, paint);
		canvas.drawRect(frame.left, frame.bottom - ScanConfig.CORNER_WIDTH,
				frame.left + ScreenRate, frame.bottom, paint);
		canvas.drawRect(frame.left, frame.bottom - ScreenRate, frame.left
				+ ScanConfig.CORNER_WIDTH, frame.bottom, paint);
		canvas.drawRect(frame.right - ScreenRate, frame.bottom
				- ScanConfig.CORNER_WIDTH, frame.right, frame.bottom, paint);
		canvas.drawRect(frame.right - ScanConfig.CORNER_WIDTH, frame.bottom
				- ScreenRate, frame.right, frame.bottom, paint);
		// 绘制扫描线
		slideTop += SPEEN_DISTANCE;
		if (slideTop >= frame.bottom) {
			slideTop = frame.top;
		}
		Rect lineRect = new Rect();
		lineRect.left = frame.left;
		lineRect.right = frame.right;
		lineRect.top = slideTop;
		lineRect.bottom = slideTop + 18;
		canvas.drawBitmap(((BitmapDrawable) (getResources()
				.getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null,
				lineRect, paint);
		// 绘制提示文字
		paint.setColor(Color.WHITE);
		paint.setTextSize(TEXT_SIZE * density);
		paint.setAlpha(0x40);
		paint.setTypeface(Typeface.create("System", Typeface.BOLD));
		String text = getResources().getString(R.string.scan_text);
		float textWidth = paint.measureText(text);
		canvas.drawText(text, (width - textWidth) / 2,
				(float) (frame.bottom + (float) TEXT_PADDING_TOP * density),
				paint);

		// Collection<ResultPoint> currentPossible = possibleResultPoints;
		// Collection<ResultPoint> currentLast = lastPossibleResultPoints;
		// if (currentPossible.isEmpty()) {
		// lastPossibleResultPoints = null;
		// } else {
		// possibleResultPoints = new HashSet<ResultPoint>(5);
		// lastPossibleResultPoints = currentPossible;
		// paint.setAlpha(OPAQUE);
		// paint.setColor(resultPointColor);
		// for (ResultPoint point : currentPossible) {
		// canvas.drawCircle(frame.left + point.getX(), frame.top
		// + point.getY(), 6.0f, paint);
		// }
		// }
		// if (currentLast != null) {
		// paint.setAlpha(OPAQUE / 2);
		// paint.setColor(resultPointColor);
		// for (ResultPoint point : currentLast) {
		// canvas.drawCircle(frame.left + point.getX(), frame.top
		// + point.getY(), 3.0f, paint);
		// }
		// }

		postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
				frame.right, frame.bottom);

	}

	public void drawViewfinder() {
		invalidate();
	}

	public void addPossibleResultPoint(ResultPoint point) {
		possibleResultPoints.add(point);
	}

}
